Synthesis and Spectral Studies of 2-Salicylidine-4-Aminophenyl Benzimidazole and its Reaction with Divalent Zn, Cd and Hg: Crystal Structure of the Cadmium Bromide Complex

Abstract

2-salicylidine-4-aminophenyl benzimidazole (SAPbzlH, LH) has been synthesised and its complexes, formulated as ZnX2L y. nH2O (X = Cl, y = 1.5, n = 1; X = Br, y = 2, n = 2; X = CH3COO, y = 1.5, n = 2), CdX2L.CH3OH.0.5H2O (X = Cl, Br) and HgX2L.nH2O (X = Cl, n = 2; X = Br, n = 0), have been characterised. A single crystal X–ray diffraction study of [Cd2Br4L2].2CH3OH.H2O has revealed its binuclear structure with dibromide and SAPbzlH bridges, the environment around each metal ion being distorted trigonal bipyramidal. A similar structure is envisaged for the chloride analogue of cadmium as well as the mercury complexes.